Add Zapier interface simulator, tree-node Merkle lookups, and user docs

In-process trace console validates hops, faults, recoveries, and
suggested changes before zapier-platform push. User guide covers
signup through central-chain and bulk-summary tree-node hash lookup.

packages/verae-archive-aggregator/src/aggregate.js

@@ -41,13 +41,26 @@ export function aggregateAttached({ sha256, tenantId, kinds = ['publicMeta', 'pr
  * @param {object[]} archiveRecords
  */
 export function mergeReceipts(chainReceipts, archiveRecords) {
-  const extra = archiveRecords
-    .filter((r) => r.kind === 'publicMeta' || r.kind === 'privateMeta' || r.kind === 'file')
-    .map((r) => ({
+  const extra = archiveRecords.map((r) => {
+    if (r.kind === 'tree') {
+      return {
+        kind: 'tree-leaf',
+        archiveId: r.archiveId,
+        attachedAt: r.storedAt,
+        itemizedOnMainChain: false,
+        merkleRoot: r.record?.merkleRoot,
+        proof: r.record?.proof,
+        leafIndex: r.record?.leafIndex,
+        chainSealJobId: r.record?.chainSealJobId,
+        ...r.record,
+      };
+    }
+    return {
       kind: r.kind === 'file' ? 'file-attach' : 'metadata-attach',
       archiveId: r.archiveId,
       attachedAt: r.storedAt,
       ...r.record,
-    }));
+    };
+  });
   return [...chainReceipts, ...extra];
 }

packages/verae-archive-aggregator/test/aggregate.test.js

@@ -25,4 +25,20 @@ describe('aggregateAttached', () => {
     assert.equal(merged[0].kind, 'seal');
     assert.equal(merged[1].kind, 'metadata-attach');
   });
+
+  it('merges tree-leaf receipts from bulk summaries', () => {
+    const seal = [{ kind: 'seal', of: 'merkleRoot', sha256: 'aa'.repeat(32) }];
+    const recs = [
+      {
+        kind: 'tree',
+        archiveId: 'tree-node-east',
+        storedAt: '2026-01-02T00:00:00Z',
+        record: { merkleRoot: 'aa'.repeat(32), leafIndex: 1, proof: [] },
+      },
+    ];
+    const merged = mergeReceipts(seal, recs);
+    assert.equal(merged[1].kind, 'tree-leaf');
+    assert.equal(merged[1].itemizedOnMainChain, false);
+    assert.equal(merged[1].archiveId, 'tree-node-east');
+  });
 });